[Elecraft] Synthesizer Issue

[Wayne Burdick]

Hi Bob,

The new frequency coverage is still part of the 160-meter band. If you need quick access to the 600-meter range (~475 kHz), you can use any of several different ways to get to it:

- the four per-band "quick memories" on 160 m

- the 100 general-purpose memories

- direct frequency entry

- a programmable function switch

As an example of the latter, you could create a K3 command macro using K3 Utility, such as:

    FA00000475000;MD3;PA0;

This sets VFO A to 475 kHz, CW mode, with the preamp off. Of course you would also want to bring the signal in through RX ANT IN or XVTR IN, so the high-pass filter in the T/R switch is bypassed. Using XVTR IN requires setting CONFIG:KXV3 to TEST. We may provide a simpler way to do this in the future.

73,
Wayne
N6KR



On Mar 2, 2015, at 6:28 PM, <riese-k3djc at juno.com> wrote:

> Hi Wayne
> 
> with the new board and software up dates is there a new band or do you
> just keep tuning below
> the BC band,,,, if we ever get 600 meters the K3 would be a great and
> only rig to have
> coverage
> 
> Bob K3DJC 
> 
> 
> On Mon, 2 Mar 2015 18:21:50 -0800 Wayne Burdick <n6kr at elecraft.com>
> writes:
>> Some users of the new synthesizer have also reported an improvement 
>> in the way diversity mode sounds. This is due to a change in the way 
>> the receivers are driven by the synths. 
>> 
>> In diversity mode, as long as the main and sub crystal filter 
>> offsets are matched, both receivers are driven by the main synth 
>> (the sub synth is not used in this case). So, when the VFO is moved, 
>> the local oscillator phase relationship remains stable between the 
>> main and sub receivers. 
>> 
>> With the original synths, moving the VFO even a small amount causes 
>> both the main and sub synths to be updated. Since they use separate 
>> LC oscillators, the phase relationship will change. The two will 
>> remain phase-locked to the reference, but the absolute value of the 
>> phase between the two synths will be some value between 0 and 180 
>> degrees.
>> 
>> We'll add this to the FAQ.
>> 
>> 73,
>> Wayne
>> N6KR
> 
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